California Solar Permit Overview
California mandates solar on most new residential construction (Title 24 / Building Energy Efficiency Standards), has the nation's largest installed solar base, and set the bar for HOA solar access law with Civil Code § 714. However, the transition to NEM 3.0 (Net Billing Tariff) in April 2023 significantly changed the economics of solar for customers of PG&E, SCE, and SDG&E — the state's three large investor-owned utilities. Export credits are now calculated at "avoided cost" rates rather than full retail, which affects payback calculations but does not change permitting requirements.
Applications submitted after April 14, 2023 to PG&E, SCE, or SDG&E fall under NEM 3.0 (Net Billing Tariff). Export credits are now based on avoided cost — typically 3–5 cents/kWh — rather than the full retail rate (25–35 cents/kWh). This dramatically changes payback calculations. Battery storage combined with solar is now strongly favored for maximizing value under NEM 3.0. This is an economics note, not a permit requirement — but it affects system design decisions that precede permitting.
California Solar — Key Facts
| Item | Detail |
|---|---|
| Regulatory Body | California Public Utilities Commission (CPUC) |
| Net Metering Program | NEM 3.0 / Net Billing Tariff (PG&E, SCE, SDG&E) |
| NEM 3.0 Export Rate | Avoided cost (~3–5¢/kWh) — varies by time of day |
| HOA Solar Law | Civil Code § 714 — HOAs cannot prohibit solar |
| HOA Cost Cap | $1,000 — HOA requirements cannot add more than this |
| Performance Cap | 10% — HOA restrictions cannot reduce output by more than this |
| Title 24 Solar Mandate | Solar required on most new residential construction since 2020 |
| Contractor License | CSLB C-46 Solar license — verify at cslb.ca.gov |
| NEC Version (typical) | 2019 California Electrical Code (based on 2017 NEC with CA amendments) |
California County Solar Permit Guides
Los Angeles County (Unincorporated)
LA County DPW Building & Safety. SCE or LADWP territory. OTC review for systems under 10kW. Fire setback rules per LAFD. $300–$800 fee.
Full county guide →San Diego County (Unincorporated)
San Diego County PDS. SDG&E territory. Expedited solar permit available. SDG&E NEM 3.0 interconnection. $200–$600 fee.
Full county guide →Riverside County
Riverside County Building & Safety. SCE territory in most of county. High solar production area. $200–$500 fee.
Full county guide →Sacramento County
Sacramento County Building Permits & Inspections. SMUD or PG&E territory. SMUD has different interconnection than IOU utilities. $200–$500 fee.
Full county guide →Contra Costa County
Contra Costa County Building Inspection. PG&E territory. Bay Area WUI fire zones affect some installations. $250–$600 fee.
Full county guide →Fresno County
Fresno County Development Services. PG&E territory. Central Valley — high solar production. Rural areas may use electric co-ops. $150–$400 fee.
Full county guide →Understanding NEM 3.0 and System Design
NEM 3.0 (the Net Billing Tariff, effective April 2023 for new applications to California's three large IOUs) fundamentally changed the value proposition of solar-only systems. Under NEM 2.0, homeowners received full retail rate credit for every kWh exported to the grid. Under NEM 3.0, export credits are calculated at the utility's avoided cost — typically 3–5 cents per kWh, compared to the 25–35 cents per kWh homeowners pay to import power.
The practical impact on permitting: many California homeowners are now installing battery storage alongside solar to shift exported power to evening hours when avoided cost rates are higher. Battery storage requires a separate permit in most California counties (under NEC Article 706). Confirm with your installer that battery storage permits are included in their proposal if you're adding storage.
Note: SMUD (Sacramento Municipal Utility District) and other municipal utilities may have different net metering programs not subject to CPUC NEM 3.0 rules. Verify your utility's program directly.
California IOU Interconnection
| Utility | Portal | Net Metering | Timeline (post-final) |
|---|---|---|---|
| PG&E | pge.com → Renewables | NEM 3.0 / Net Billing Tariff | 20–45 business days |
| SCE (Southern CA Edison) | sce.com → Solar & Renewables | NEM 3.0 / Net Billing Tariff | 20–40 business days |
| SDG&E | sdge.com → Solar | NEM 3.0 / Net Billing Tariff | 15–30 business days |
| SMUD | smud.org → Solar | SMUD Net Energy Metering (retail rate, different from CPUC NEM 3.0) | 15–25 business days |
| LADWP | ladwp.com → Solar | LADWP Feed-In Tariff / Net Metering (separate from CPUC rules) | 15–30 business days |
HOA Solar Rights — Civil Code § 714
California Civil Code § 714 prohibits HOAs from banning solar installations. HOA requirements cannot add more than $1,000 to installation cost or reduce system output by more than 10%. HOAs have a reasonable time to respond to applications — failure to respond does not automatically grant approval under California law (unlike New Jersey's 45-day deemed-approved rule). Full guide: HOA Solar Rights by State.
Title 24 — California Solar Mandate for New Construction
Since January 1, 2020, California's Title 24 Building Energy Efficiency Standards require solar PV on most new single-family residences and low-rise multifamily buildings. If you're building a new home, solar is not optional — it's part of the building permit. The size requirement is calculated based on conditioned floor area and climate zone. Battery storage is encouraged but not yet mandated for most residential builds under current Title 24 standards (2022 standards, effective January 2023).
California Solar FAQ
NEM 3.0 does reduce the value of exported power significantly compared to NEM 2.0. However, the picture is more nuanced than a simple comparison suggests. Self-consumption (using the power you generate directly, without exporting) remains fully valued — it offsets retail-rate imports. Systems designed for high self-consumption, or paired with battery storage that shifts usage to evening peak hours, can still achieve competitive payback periods. The economics are more complex to calculate under NEM 3.0, which is why battery storage has become standard in most California proposals.
Solar installations in California should be performed by a CSLB-licensed contractor. The C-46 Solar Contractor license is specifically designed for solar work. A C-10 Electrical Contractor can also perform the electrical portions. Some projects combine both. Verify your installer's CSLB license at cslb.ca.gov and confirm the license is current and in good standing before signing a contract.
Total timeline varies significantly by county and utility. A typical California residential solar installation from permit submission to PTO runs 8–16 weeks. Permit approval: 5–20 business days depending on county. Inspections: typically within 1 week of scheduling. Utility interconnection (PG&E, SCE, SDG&E): 20–45 business days from final inspection. Submitting the interconnection application simultaneously with the permit application is the single biggest timeline reducer. See our full permit timeline guide.